数据挖掘技术在大坝安全决策支持系统中的应用

数据挖掘技术是一个新兴的，具有广阔应用前景和极富挑战性的研究领域。在充分研究大坝安全决策支持系统的基础上，结合数据挖掘技术的概念与方法等，对数据挖掘技术在大坝安全决策支持系统中的应用进行论述，与此同时，运用数据挖掘技术分析了某大坝垂直位移测值突变的物理成因。     

乳化液浓度自动检测配比系统

本文论述了乳化液浓度自动检测配比系统。文章给出了阻容型浓度、液位传感器的原理、结构和测试电路，以及实现乳化液浓度自动检测与自动配比的系统硬件和软件。系统样机通过了型式试验、防爆和工业性试验。研究结构表明，本系统性能优良，达到了煤矿监控产品技术标准，对提高煤机械自动化程度具有重要意义，推广应用前景广阔。     

线性规划模型的自动生成与求解

本文描述了《有色企业经济活动分析决策支持系统》模型库中线性规划模型的自动生成与求解系统的设计思想、方法及实现     

高层建筑屋面悬挑曲梁结构施工技术

本文通过工程实例,说明采用型钢和钢管组合支撑体系,解决高层建筑屋面悬挑曲梁结构的支模难题,保证工程质量和施工安全,并探讨施工中型钢的节点连接做法。     

构皮滩水电站尾水隧洞特大断面软岩开挖支护

构皮滩水电站尾水隧洞软岩不良地质洞段占尾水隧洞全长的70%以上,确保软岩洞段的安全快速开挖是尾水隧洞施工的关键,尤其一次支护的强度对洞室稳定影响极大。为此,施工中根据软岩的地质特点及尾水隧洞开挖的断面尺寸,采取分层开挖和超前锚杆的施工方式和型钢拱架进行一次支护。根据监测结果,围岩变形很小,一次支护效果良好,表明构皮滩水电站尾水隧洞大断面软岩采取的开挖方式和一次支护方式是成功的。     

Direct atomic scale analysis of the distribution of Cu valence states in Cu/γ-Al2O3 catalysts

In this paper, the microstructure of a 1 wt.% Cu/γ-Al₂O₃ catalyst that was reduced in a 4% hydrogen/argon atmosphere at temperatures of 523, 773 and 1073 K, is studied by Z-contrast imaging and electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM). Results show that the copper species are well dispersed when the catalyst is reduced below 523 K. At 773 K, separated Cu(I) and Cu(0) species are found existing as ring-like and bulk-like particles. This appears to indicate that the copper has not been reduced to its metallic form due to the interaction between the copper oxide and the support. Large spherical particles having core-shell structures with Cu(I) in the shells and Cu(0) in the cores are generated when the catalyst is reduced at 1073 K. The formation of partially oxidized copper species upon reduction at 1073 K is attributed to the metallic copper interaction with the alumina support. This study also demonstrates that high-spatial resolution Z-contrast imaging and EELS performed simultaneously can provide unique information on the morphology and chemistry of metal species in supported metal catalysts.     

巷道最佳注浆加固时机的分析研究

对松散破碎以及软弱围岩巷道进行注浆加固巷道围岩时,注浆时机的选择对注浆效果具有很大的影响。有效地进行注浆加固的先决条件是浆液能够在围岩中均匀地流动渗透到一定范围,且注浆后能明显提高围岩强度和整体承载能力。在综合考虑围岩裂隙的发育程度、注浆加固体的强度、所需控制的围岩变形量及注浆工艺等因素的基础上,确定了最佳的注浆时机——滞后15d～25d。     

Integrating motivational, social, and contextual work design features: A meta-analytic summary and theoretical extension of the work design literature.

The authors developed and meta-analytically examined hypotheses designed to test and extend work design theory by integrating motivational, social, and work context characteristics. Results from a summary of 259 studies and 219,625 participants showed that 14 work characteristics explained, on average, 43% of the variance in the 19 worker attitudes and behaviors examined. For example, motivational characteristics explained 25% of the variance in subjective performance, 2% in turnover perceptions, 34% in job satisfaction, 24% in organizational commitment, and 26% in role perception outcomes. Beyond motivational characteristics, social characteristics explained incremental variances of 9% of the variance in subjective performance, 24% in turnover intentions, 17% in job satisfaction, 40% in organizational commitment, and 18% in role perception outcomes. Finally, beyond both motivational and social characteristics, work context characteristics explained incremental variances of 4% in job satisfaction and 16% in stress. The results of this study suggest numerous opportunities for the continued development of work design theory and practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

土钉支护在深基坑开挖中的应用

深圳某银行办公楼的深基坑支护采用了土钉支护，不但保证了施工质量，而且缩短了工期，减少了投资，以此工程为例介绍了土钉支护的土力学参数计算、结构设计、施工方案、技术措施和取得的显著效果。     

底支承对小口径反射镜镜面变形的影响

论述了运用有限元技术研究镜面变形的方法及分析底支承在不同口径，焦比、厚径比和相对支承半径时镜面变形的技术；在取得的相互关联的最大镜面变形数据基础上，研究了影响小口径反射镜底支承镜面变形的因素。